Is it necessary to do niyat for qaza from night before? Can we make niyat of qaza when we get up at Sehri? Secondly what about the sawm which we kept when we did not know the ruling that if niyat is done from night and you do not wake up in Sehri your sawm has commenced. Do we have to make 1 qaza or 2 qaza? For Ed I intend to keep my qaza sawm of 1 Ramadan of some year but I did not wake up in Sehri and thought my sawm has not commenced. Do I have to repeat that qaza sawm only or do IO have to keep qaza of this qaza sawm also?

For the validity of qaza sawm, it is necessary to make intention before true dawn. While eating the Sehri one can make intention of qaza. But, if you did not make intention in the night and also did not wake up to eat the Sehri and kept the fast without it then the fast shall be counted as nafl and it will not be counted as qaza of the missed fast. But if you make the intention of qaza fast in the night but you did not eat the Sehri due to sleeping and kept the fast in the same state then the fast will be valid as qaza and now you need not keep the fast again.